The first lesson at Great Vespers (Genesis 28:10-17) describes Jacob’s dream of a ladder reaching from earth to heaven, and the angels ascending and descending upon it. The second lesson (Ezekiel 43:27-44:4) speaks of the gate of the sanctuary which faces east. God enters through this gate, which is shut so that no one else can enter by it. The third reading (Proverbs 9:1-11) talks about the house that Wisdom has built.
These readings are interpreted as prefiguring the Mother of God.
Troparion (In Tone 4)
Your Nativity, O Virgin, Has proclaimed joy to the whole universe! The Sun of Righteousness, Christ our God, Has shone from You, O Theotokos! By annulling the curse, He bestowed a blessing. By destroying death, He has granted us eternal Life.
Kontakion (In Tone 4)
By Your Nativity, O Most Pure Virgin, Joachim and Anna are freed from barrenness; Adam and Eve,
from the corruption of death. And we, your people, freed from the guilt of sin, celebrate and sing to you:
The barren woman gives birth to the Theotokos, the nourisher of our life